# Q: What is the prime factorization of the number 100?

- The prime factors are: 2 x 2 x 5 x 5
- or also written as { 2, 2, 5, 5 }

- Written in exponential form: 2
^{2}x 5^{2}

A:

- The prime factors are: 2 x 2 x 5 x 5
- or also written as { 2, 2, 5, 5 }

- Written in exponential form: 2
^{2}x 5^{2}

**Prime factorization** or **prime factor decomposition** is the process of finding which prime numbers can be multiplied together to make the original number.

To find the prime factors, you start by dividing the number by the first prime number, which is 2. If there
**is not** a remainder, meaning you can divide evenly, then 2 is a factor of the number. Continue dividing by 2 until you cannot divide evenly anymore. Write down how many 2's you were able to divide by evenly.
Now try dividing by the next prime factor, which is 3. The goal is to get to a quotient of 1.

Here are the first several prime factors: 2, 3, 5, 7, 11, 13, 17, 19, 23, 29...

Let's start by dividing 100 by 2

100 ÷ 2 = 50 - No remainder! 2 is one of the factors!

50 ÷ 2 = 25 - No remainder! 2 is one of the factors!

25 ÷ 2 = 12.5 - There is a remainder. We can't divide by 2 evenly anymore. Let's try the next prime number

25 ÷ 3 = 8.3333 - This has a remainder. 3 is not a factor.

25 ÷ 5 = 5 - No remainder! 5 is one of the factors!

5 ÷ 5 = 1 - No remainder! 5 is one of the factors!

The orange divisor(s) above are the prime factors of the number 100. If we put all of it together we have the factors 2 x 2 x 5 x 5 = 100. It can also be written in exponential form as 2^{2} x 5^{2}.

Another way to do prime factorization is to use a factor tree. Below is a factor tree for the number 100.

100 | ||||

2 | 50 | |||

2 | 25 | |||

5 | 5 |

Try the factor calculator

General Questions

- How is the number 100 written in scientific notation?
- What is the absolute value of the number 100?
- What is the negative version of the number 100?
- What is the place value chart for the number 100?
- What is the digital root of the number 100?
- How many digits is in the number 100?
- How is 100 written in roman numerals?

Factoring Questions

- What are the factors or divisors of the number 100?
- What are the prime factors of the number 100?
- What is the total number of factors of the number 100?
- What is the total number of prime factors of the number 100?
- What is the sum of all factors of the number 100 including 100?
- What is the sum of all factors of the number 100 excluding 100?
- What are the factor combinations of the number 100?
- What is the prime factorization of the number 100?

Calculation Questions

Miscellaneous Questions

- How much data will 100 bytes hold in different storage units?
- What is 100 in other base number systems?
- How is 100 spelled out in other languages or countries?
- How is 100 formatted in other languages or countries?
- How is 100 formatted as currency in different languages or countries?
- What are the different hash algorithm outputs for 100?